Looks like the OP is close to a final resolution:
http://legacygt.com/forums/showthread.php/timing-belt-came-off-cam-while-driving-247105p7.html
A photo of the tensioner bolt (post #93) shows obvious stretching. Looks like the mechanic used an impact wrench, not a torque wrench.
http://legacygt.com/forums/showthread.php/timing-belt-came-off-cam-while-driving-247105p7.html
A photo of the tensioner bolt (post #93) shows obvious stretching. Looks like the mechanic used an impact wrench, not a torque wrench.